1,1

Table of n, a(n) for n=1..10.

a(n)=A061799(A048691(a(n-1))). [From R. J. Mathar, Jan 21 2009]

4^2 = 16 with 5 divisors; smallest number with at least 5 divisors is 12

Sequence in context: A276534 A304986 A013333 * A062000 A053040 A154734

Adjacent sequences: A154879 A154880 A154881 * A154883 A154884 A154885

nonn

J. Lowell, Jan 16 2009

a(6)-a(10) from Donovan Johnson, May 09 2009

approved